Left hand drill bit? Drill a pilot hole with a tiny bit then try the Left hand. Also might not hurt to throw some heat on it. I put loctite on mine, Im sure they would be a bitch to take out without cooking the loctite out.yeah thats what im trying top avoid, fjklfjasdklfhoaghjasdf
OD in front UD in rear
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Yeah what does OD UD mean?